Alloy density problem, what is the density of an alloy?

The little big buffalo is correct, and it is analyzed here.

Answer: The density of an alloy is that when two metals are mixed, either both are both dense, or one is greater than and less than.

According to the options in the question, only gold is greater, so there must be a combination of gold in the alloy, and according to the mixing ratio, it can be a gold-lead alloy, a gold-silver alloy, or a gold-copper alloy.

If we ignore the change in density caused by the atomic size gap when two metals are mixed, the mass fraction can be calculated as follows: let the mass fraction of gold be x, and the other is y

then there is x+y=1,; By substituting the densities of lead, silver, and copper respectively, we can find that these three metals are mixed with gold, and the density required by the question is the mass fraction of the two metals (note: after considering the atomic size, there is often a certain deviation between the calculation result and the actual result, but it does not affect the judgment of the result of this question).

Gold and silver or gold and lead. Because the density of the alloy is between the density of the two substances.

Landlord, I'm sure your number input is wrong, this density is about the same as water, do you think the density of these four metals will be about the same as water no matter how you combine them?

Mistyped it! Can't do it.

The density of the alloy is.

The formation of alloys often improves the elemental properties, for example, steel is stronger than its main constituent element, iron. Physical properties of the alloy, e.g. dust density, reactivity, Young's modulus.

The electrical and thermal conductivity may be similar to the constituent elements of the alloy, but the tensile strength of the alloy.

and shear strength, however, are often very different from the properties of the constituent elements.

This is due to the fact that the arrangement of atoms in alloys is very different from that in elemental matter. A small amount of an element can have a big impact on the properties of an alloy. For example, impurities in ferromagnetic alloys can change the properties of the alloy.

Unlike pure metals, most alloys do not have a fixed melting point, and when the temperature is in the melting temperature range, the mixture is in a solid-liquid state.

Alloy chemicals

The alloy is macroscopic homogeneous and contains metallic elements.

A pluralistic substance, generally with metallic properties. Any element can be used as an alloying element, but a large amount of metal is still added. The most basic and independent substances that make up an alloy are called components, an alloy composed of two components is called a binary alloy, and an alloy composed of three components is called a ternary alloy.

In the solid state, the alloy may be a mixture of single phase or complex phase; It may be crystalline, quasicrystalline or amorphous, depending on the atomic radius of the elements in which it is constituent.

Depending on the difference in electronegative properties and electron concentration, there may be a solid solution that maintains the same structure as the pure element of the substrate.

Mesophase.

If the density of the original metal is large, and the density of the metal mixed in later is smaller than that of the original metal, then the density of the stove resistance alloy is smaller than that of the original metal, such as adding lead to gold. If the density of the original metal is less than that of the metal that was mixed in later. Then the density of the alloy is greater than that of the primary metal.

Alloy is a substance with metallic properties that is synthesized by a certain method from two or more metals and metals or non-metals. It is generally obtained by melting into a homogeneous liquid and solidifying. According to the number of constituent elements, it can be divided into two acres of laughing yuan alloy, ternary alloy and multi-alloy alloy.

The composition of the alloy is very complex, and the density of the alloy will be larger or smaller than the density of the pure metal of the composition, take the following copper alloy as an example:

The density of copper is, the density of zinc is, and the density of gold is.

"Zinc-copper alloy" is commonly referred to as "copper-zinc alloy" and is the main body of brass. Obviously, the more zinc is added to copper, the less dense the alloy will be.

If you know that copper is already present in an alloy of copper and a heavy metal or metals that are more dense than it is (of course, it can also contain a small amount of less dense elements).

Copper-gold alloy or gold-copper alloy, the market has **. Now it is assumed that it is a gold-copper alloy, and the mass percentage of the composition of the gold-copper binary alloy with a density can be calculated as follows.

Let the density of copper be 1, and the density of gold is 2;Within the volume of 1cm3 alloy, copper has a volume of v1 and a mass of m1, and gold has a volume of v2 and a mass of m2

then there is v1+v2=1[cm3].

m1+m2=

1·v1+ρ2·v2=

1·v1+ρ2·(1-v1)=

v1=(m1=ρ1·v1=

m2 = i.e. in the copper-gold alloy.

The mass percentage of copper is: Cu=m1

The mass percentage of gold is au=m2

If it is not a copper-gold alloy, then, there are many other heavy and high cover metals, and the mass percentage can also vary in a wide range, and its composition cannot be judged only according to the density of the alloy, so it must be chemically qualitative, quantitative, or spectral qualitative, semi-quantitative analysis.

Element number: 3

Element symbol: li

Element name: Lithium.

Elemental atomic weight:

Element Type: Metal.

Discovered by: Alfeldson Present Date: 1817.

Hydrogen is found in gases obtained from the interaction of metals with acids. In 1817, Alferdsson of Sweden first discovered lithium in the analysis of petalite feldspar.

Element Description: Silvery-white metal. Density gram 3

Melting point: boiling point: 1317is the lightest metal. It can react with a large number of inorganic reagents and organic reagents.

The reaction with water is very violent. It is easy to react with hydrogen at about 500, and is the only alkali metal that can generate hydride that is stable enough to melt without decomposing, and ionization energy electron volts, and oxygen, nitrogen, sulfur, etc., are the only alkali metal that reacts with nitrogen at room temperature to form lithium nitride (Li3N). Because it is susceptible to oxidation and darkening, it should be stored in liquid paraffin.

Elemental use: Tritium can be obtained by placing an isotope (6li) with a mass of 6 in an atomic reactor and irradiating it with neutrons. Tritium can be used for thermonuclear reactions and has an important use.

Lithium is mainly used as a thickener in grease in the form of lithium stearate. This lubricant combines high water resistance, high temperature resistance and good low temperature properties. Lithium is used in ceramic products to act as a co-solvent.

It is also used as a deoxidizer or dechlorinator in the metallurgical industry, as well as lead-based bearing alloys. Lithium is also an important component of beryllium, magnesium, and aluminum light alloys.

Elemental Aids:

Lithium is another alkaline gold element discovered after potassium and sodium. It was Alfetersen, a student of the Swedish chemist Betsilius, who discovered it. In 1817, while analyzing hebraspar, he finally discovered a new metal, which Berzirius named lithium, and the element symbol li

The word comes from the Greek word lithos (stone).

The year after the discovery of lithium, it was re-analyzed and confirmed by the French chemist Faucland.

Lithium is much less abundant in the earth's crust than potassium and sodium, and its compounds are rare, which is an inevitable factor in its later discovery than potassium and sodium.

Lithium-lithium alloys.

Summary. Hello dear. The density of the alloy block is. Alloy is a substance with metallic properties that is synthesized by a certain method from two or more metals and metals or non-metals. It is generally obtained by melting into a homogeneous liquid and solidifying.

Hello. Your question has been seen, and the answer is being sorted out for you, and it will be answered for you immediately, so please don't end the consultation.

Hello dear. The density of the alloy block is. An alloy is a substance with metallic properties that is synthesized by a certain method between two or more metals and metals and metals or non-metals. Generally, it is judged by melting into a homogeneous liquid and solidifying.

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The buoyancy f float = g2-f2 = on large handicrafts, the two are completely submerged, according to Archimedes' principle, the volume of the liquid discharged by the two is the volume of the alloy:

v1 = f float g

4×10-5m3，v2=

f Floating g

8 10-5m3, the density of both:

1=m1v1

g1v1g2n4×10?5m3×10n/kg

5×103kg/m3=5g/cm3，ρ2=m2v2

g2v2g3n8×10?5m3 10n kg, 1 2, the density of the alloy is 5g cm3, and the large handicrafts are hollow;

According to the definition, density = mass, volume, mass per unit volume, known alloy is composed of two substances, the masses are m1, m2 know its molar content ratio, if the atomic weight is m1, m2 respectively, then the molar content ratio = m1 m1 : m2 m2 plus know the overall volume v and the density is d1, d2 then v= m1 d1 + m2 d2

Solving the above simultaneous equations yields m1, m2

You know that the alloy density = (m1+m2) v

You can think of the results as formulas.

Mine: A long time ago, was the high school entrance examination so troublesome? Just take the mass volume and try it, no, look at it again.

The lack of handicraft volume makes it impossible to calculate the alloy density.